/Engine/Plugins/Animation/IKRig/Source/IKRig/Public/Retargeter/IKRetargetProcessor.h
struct FRetargetChainPair
FTargetChainSet...
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FName
SourceBoneChainName
TArray< int32 >
SourceBoneIndices
FName
TargetBoneChainName
TArray< int32 >
TargetBoneIndices